[1] Yonsei Univ, Coll Med, Dept Emergency Med, Seoul, South Korea
[2] Hallym Univ, Kangdong Sacred Heart Hosp, Dept Emergency Med, Coll Med, Seoul, South Korea
[3] Ajou Univ, Sch Med, Dept Emergency Med, Suwon, South Korea
[4] Yonsei Univ, Wonju Coll Med, Dept Emergency Med, 20 Ilsan Ro, Wonju 26426, South Korea
[5] Korea Univ, Coll Med, Dept Pediat, Seoul, South Korea
[6] Korea Univ, Inst Nano Regenerat Reconstruct, Seoul, South Korea
[7] CHA Univ, Ilsan Med Ctr, Dept Pediat, Goyang, South Korea
[8] Hallym Univ, Kangnam Sacred Heart Hosp, Dept Emergency Med, Seoul, South Korea
[9] Seoul Natl Univ, Coll Med, Dept Pediat, Seoul 03080, South Korea
[10] Hanyang Univ, Coll Med, Dept Emergency Med, Seoul, South Korea
[11] Chung Ang Univ, Coll Med, Dept Emergency Med, Seoul, South Korea
[12] Kyung Hee Univ, Dept Neurol, Coll Med, Seoul, South Korea
[13] Chonnam Natl Univ, Dept Emergency Med, Med Sch, Gwangju, South Korea
[14] Seoul Med Ctr, Dept Pediat, Seoul, South Korea